msm8953-common: Fix USB config extra property

* It should be persist.vendor.usb.config.extra, not persist.vendor.sys.usb.config.extra

Change-Id: Icc5531c5563f1975314be38f5f7567e1c0f5eb8d

prop.mk

@@ -183,7 +183,7 @@ sys.use_fifo_ui=1
 
 # Usb
 PRODUCT_PROPERTY_OVERRIDES += \
-persist.vendor.sys.usb.config.extra=none
+persist.vendor.usb.config.extra=none
 
 # Wifi
 PRODUCT_PROPERTY_OVERRIDES += \